Idk what battery to purchase

[Riree]

How do I wire the controller up to the battery, on/off switch ,motor, and throttle? The brand is called CRYBY.

 

[Riree]

Motor is 42- 78 volts and 3000 watts what kind of battery should I purchase?

 

[neptronix]

What motor model?
What kind of speeds & range do you want to achieve?
What kind of terrain are you dealing with ( no hills, mostly hilly, huge mountain climbs )
And what's it going into?